Dynamic Color Gamut Adjustment via Hybrid Light Source
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display systems face challenges in expanding the color gamut without increasing costs and reducing efficiency, particularly when trying to reach standards like DCI-P3 or REC2020, as current methods require significant additions of high-power red-green laser light, leading to inefficiencies and high costs.
Innovation Solution
A system and method that dynamically adjusts the color gamut by combining excitation light with narrow-spectrum primary-color light, using a light source system comprising an excitation light source and a narrow-spectrum primary-color light source, and an imaging system with a spatial light modulation device, which calculates and adjusts luminance control values to optimize the luminance of both broad-spectrum and narrow-spectrum primary-color lights, allowing for dynamic color gamut compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If filtering device is added to narrow the spectrum of phosphor light, then color purity and color gamut are improved, but optical power loss increases and efficiency decreases
Solution Approach 1:
The patent combines phosphor light (broad spectrum) with laser light (narrow spectrum) to create a hybrid light source. The phosphor light provides high efficiency and broad spectrum coverage, while the laser light supplements specific color regions to expand color gamut. This merging approach achieves color purity improvement without the significant optical power loss associated with filtering alone.
Solution Approach 2:
The patent creates a composite light source by combining different light generation mechanisms (phosphor conversion and laser emission). This composite approach leverages the advantages of both: phosphor's high efficiency and broad spectrum, plus laser's narrow spectrum and high color purity, achieving both efficiency and color quality improvement.
2Adaptability or versatility
If pure-color laser light is added to expand color gamut to DCI-P3 standard, then color gamut is improved, but system cost greatly increases due to need for high-power red-green laser light
Solution Approach 1:
Instead of using full-power red-green laser light throughout, the patent applies laser light selectively and partially. The laser component is used to supplement specific color regions where phosphor light is insufficient, rather than replacing all phosphor light with laser light. This partial action approach achieves DCI-P3 color gamut compliance while significantly reducing system cost.
Solution Approach 2:
The patent dynamically adjusts the proportion and intensity of laser light versus phosphor light based on display content requirements. By changing the operational parameters of the laser light source according to actual display needs, the system achieves high color gamut when required while maintaining lower cost operation during normal conditions.
3Adaptability or versatility
If sufficient red-green laser light is added and filtering device is used to achieve rec2020 color gamut, then color gamut is improved, but efficiency is greatly reduced by over 30%
Solution Approach 1:
The patent merges phosphor light (high efficiency) with laser light (high color purity) in a complementary ratio. The phosphor light provides the bulk of the illumination maintaining high efficiency, while laser light is added in controlled amounts to achieve rec2020 color gamut. This merging avoids the efficiency loss that occurs when relying solely on laser light or excessive filtering.
Solution Approach 2:
The patent optimizes the intensity ratio and spectral distribution parameters of the combined light source. By carefully controlling the proportion of laser light to phosphor light and adjusting their spectral characteristics, the system achieves rec2020 color gamut while minimizing efficiency loss, maintaining productivity at acceptable levels.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively expands the color gamut to the REC2020 standard while maintaining high efficiency and reducing chromatic aberration, optimizing luminance and minimizing the need for high-power red-green laser light, thus addressing the inefficiencies and cost issues of previous methods.
Implementation Method 1
phosphor powder on a wavelength conversion device is excited by short-wavelength visible light of the laser, to generate sequential primary-color fluorescence or white light
Implementation Method 2
pure red-green laser is incorporated into the laser fluorescence to expand the color gamut of the light source
Implementation Method 3
the imaging system includes a spatial light modulation device and the system for dynamically adjusting the color gamut of the display system is suitable to be comprised in the imaging system
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A system (221) and method for dynamically adjusting the color gamut of a display system, and a display system (1). The display system (1) comprises a light source system (10) and an imaging system (20). The light source system (1) comprises an excitation light source (110) and a narrow-spectrum primary light source (120). The excitation light source (110) emits excitation light that is processed to output at least one type of wide-spectrum primary light. The narrow-spectrum primary light source (120) outputs at least one type of narrow-spectrum primary light. The narrow-spectrum primary light and the wide-spectrum primary light are combined and then output to the imaging system (20). The method comprises: calculating color coordinates and brightness of the brightest pixel of an image frame (S1); calculating a minimum brightness value of the wide-spectrum primary light according to the color coordinates and brightness of both the primary light of the light source system (10) and the brightest pixel (S2); calculating bright values of the narrow-spectrum primary light (S3-S5); and generating and outputting light source brightness signals of the excitation light source (110) and the narrow-spectrum primary light source (120) according to the brightness values (S6), in order to adjust the brightness of light emitted by the excitation light source (110) and the narrow-spectrum primary light source (120) (S7). Therefore, the efficiency is improved and the costs are reduced while enhancing the color gamut.